Self-nanoscaling of the soft magnetic phase in bulk SmCo/Fe nanocomposite magnets

TitleSelf-nanoscaling of the soft magnetic phase in bulk SmCo/Fe nanocomposite magnets
Publication TypeJournal Article
Year of Publication2011
AuthorsRong CB, Zhang Y, Poudyal N, Szlufarska I, Hebert RJ, Kramer MJ, Liu JP
Journal TitleJournal of Materials Science
Date Published09
Type of ArticleArticle
ISBN Number0022-2461
Accession NumberWOS:000291951900019
Keywordsanisotropy, composites, deformation, energy product, GEOMETRY, instability, microstructure, multilayers, permanent-magnets, remanence enhancement

Fabrication of bulk nanocomposite materials, which contain a magnetically hard phase and a magnetically soft phase with desired nanoscale morphology and composition distribution has proven to be challenging. Here we demonstrate that SmCo/Fe(Co) hard/soft nanocomposite materials can be produced by distributing the soft magnetic alpha-Fe(Co) phase particles homogenously in a hard magnetic SmCo phase matrix through a combination of high-energy ball milling and a warm compaction. Severe plastic deformation during the ball milling results in nanoscaling of the soft phase with size reduction from micrometers to similar to 15 nm. Up to 35% of the soft phase can be incorporated into the composites without coarsening. This process produces fully dense bulk isotropic nanocomposite materials with remarkable energy-product enhancement (up to 300%) owing to effective inter-phase exchange coupling.

Alternate JournalJ. Mater. Sci.